The roots of the teeth #19 and 30 fracture 6 years 5 months post cementation at #18 (Fig.11).  Since gingival recession is severe at #18 probably related to the large implant, the one at #19 will be designed small. 

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Xin Wei, DDS, PhD, MS 1st edition 07/17/2021, last revision 07/18/2021